Soviets exchange American for captured Russian spy. (2013). The History Channel website. Retrieved 12:18, May 19, 2013, from http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy.
Soviets exchange American for captured Russian spy. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy [Accessed 19 May 2013].
“Soviets exchange American for captured Russian spy.” 2013. The History Channel website. May 19 2013, 12:18 http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy.
“Soviets exchange American for captured Russian spy,” The History Channel website, 2013, http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy [accessed May 19, 2013].
“Soviets exchange American for captured Russian spy,” The History Channel website, http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy (accessed May 19, 2013).
Soviets exchange American for captured Russian spy [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy.
Soviets exchange American for captured Russian spy, http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy (last visited May 19, 2013).
Soviets exchange American for captured Russian spy. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/soviets-exchange-american-for-captured-russian-spy. Accessed May 19, 2013.